William Stansbury Thompson (born December 1, 1963) is an American retired professional basketball player who played in the National Basketball Association and other leagues. He spent a 5-year career with the Los Angeles Lakers and Miami Heat, and registered one minute of court time with the Golden State Warriors in 1991.

Thompson played basketball at Camden High School in New Jersey, where he was a two-time high school All-American. Thompson was considered the number one high school prospect in the land. He elected to play college basketball for Denny Crum at the University of Louisville. His team reached the semi-finals of the national championship his freshman year, where they lost to the University of Houston. In his junior year he led the Cardinals in scoring, rebounding and assists. His senior season the Cardinals won the 1986 NCAA national championship.

In the 1986 NBA Draft he was selected 19th overall by the Atlanta Hawks. In a draft-day trade he was sent to the Los Angeles Lakers. He was a reserve on the Lakers teams that won back-to-back NBA Championships in 1986-87 and 1987-88. He is one of only four players to have won an NCAA championship and an NBA championship in back to back seasons, the other three being Bill Russell (University of San Francisco 1956, Boston Celtics 1957), Henry Bibby (UCLA 1972, New York Knicks 1973) and Earvin Johnson (Michigan State 1979, Los Angeles Lakers 1980).

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